<?php

/**
 * @package Unite Showbiz Slider for Joomla 1.7-3.1
 * @author UniteCMS.net
 * @copyright (C) 2012 Unite CMS, All Rights Reserved. 
 * @license GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 * */
// No direct access.
defined('_JEXEC') or die;

class UniteDBBiz {

    private $jdb;
    private $lastRowID;

    /**
     * 
     * constructor - set database object
     */
    public function __construct() {
        $this->jdb = JFactory::getDBO();
    }

    /**
     * 
     * throw error
     */
    private function throwError($message, $code = -1) {
        UniteFunctionsRev::throwError($message, $code);
    }

    //------------------------------------------------------------
    // validate for errors
    private function checkForErrors($prefix = "") {
        $errorNum = $this->jdb->getErrorNum();
        if ($errorNum) {
            $message = $this->jdb->getErrorMsg();
            if (!empty($prefix))
                $message = $prefix . " " . $message;

            $this->throwError($message, $errorNum);
        }
    }

    /**
     * 
     * insert variables to some table
     */
    public function insert($tableName, $arrItems) {

        $strFields = "";
        $strValues = "";
        foreach ($arrItems as $field => $value) {
            $value = "'" . $this->escape($value) . "'";
            if ($field == "id")
                continue;
            if ($strFields != "")
                $strFields .= ",";
            if ($strValues != "")
                $strValues .= ",";
            $strFields .= $field;
            $strValues .= $value;
        }

        $insertQuery = "insert into $tableName($strFields) values($strValues)";

        $this->runSql($insertQuery, "insert");
        $this->lastRowID = $this->jdb->insertid();

        return($this->lastRowID);
    }

    /**
     * 
     * get last insert id
     */
    public function getLastInsertID() {
        $this->lastRowID = $this->jdb->insertid();
        return($this->lastRowID);
    }

    /**
     * 
     * delete rows
     */
    public function delete($table, $where) {

        UniteFunctionsRev::validateNotEmpty($table, "table name");
        UniteFunctionsRev::validateNotEmpty($where, "where");

        $query = "delete from $table where $where";

        $success = $this->runSql($query, "delete error");
        return($success);
    }

    /**
     * 
     * insert variables to some table
     */
    public function update($tableName, $arrData, $where) {
        $wheres = "";
        if (is_array($where)) {
            foreach ($where as $field => $value) {
                $value = "'" . $this->escape($value) . "'";
                if ($wheres != "")
                    $wheres .= ",";
                $wheres .= "$field=$value";
            }
        }else {
        $wheres = $where;    
        }

        UniteFunctionsRev::validateNotEmpty($tableName, "table cannot be empty");
        UniteFunctionsRev::validateNotEmpty($where, "where cannot be empty");

        $strFields = "";
        foreach ($arrData as $field => $value) {
            $value = "'" . $this->escape($value) . "'";
            if ($strFields != "")
                $strFields .= ",";
            $strFields .= "$field=$value";
        }

        $updateQuery = "update $tableName set $strFields where $wheres";

        $numRows = $this->runSql($updateQuery, "update error");
        return($numRows);
    }

    /**
     * 
     * execute query, get number of rows affected 
     */
    public function runSql($query, $errorMessage = "Regular Guery") {

        $this->jdb->setQuery($query);
        $success = $this->jdb->query();
        $this->checkForErrors($errorMessage);
        if ($success == false)
            $this->throwError("query execution failed");

        $numRows = $this->jdb->getAffectedRows();
        return($numRows);
    }

    /**
     * 
     * fetch rows from sql query
     */
    public function fetchSql($query) {

        $this->jdb->setQuery($query);
        //$response = $this->jdb->execute();			
        $this->checkForErrors("fetch");
        $rows = $this->jdb->loadObjectList();
        $rows = UniteFunctionsRev::convertStdClassToArray($rows);

        return($rows);
    }

    /**
     * 
     * get data array from the database
     * 
     */
    public function fetch($tableName, $where = "", $orderField = "", $groupByField = "", $sqlAddon = "") {

        $query = "select * from $tableName";
        if ($where)
            $query .= " where $where";
        if ($orderField)
            $query .= " order by $orderField";
        if ($groupByField)
            $query .= " group by $groupByField";
        if ($sqlAddon)
            $query .= " " . $sqlAddon;
        $rows = $this->fetchSql($query);

        return($rows);
    }

    /**
     * 
     * fetch only one item. if not found - throw error
     */
    public function fetchSingle($tableName, $where = "", $orderField = "", $groupByField = "", $sqlAddon = "") {
        $response = $this->fetch($tableName, $where, $orderField, $groupByField, $sqlAddon);
        if (empty($response))
            $this->throwError("Record not found");
        $record = $response[0];
        return($record);
    }

    /**
     * 
     * escape data to avoid sql errors and injections.
     */
    public function escape($string) {
        $newString = $this->jdb->escape($string);
        return($newString);
    }

}

?>